(src gopacket.PacketDataSource)
| 33 | ) |
| 34 | |
| 35 | func Run(src gopacket.PacketDataSource) { |
| 36 | if !flag.Parsed() { |
| 37 | log.Fatalln("Run called without flags.Parse() being called") |
| 38 | } |
| 39 | var dec gopacket.Decoder |
| 40 | var ok bool |
| 41 | if dec, ok = gopacket.DecodersByLayerName[*decoder]; !ok { |
| 42 | log.Fatalln("No decoder named", *decoder) |
| 43 | } |
| 44 | source := gopacket.NewPacketSource(src, dec) |
| 45 | source.Lazy = *lazy |
| 46 | source.NoCopy = true |
| 47 | source.DecodeStreamsAsDatagrams = true |
| 48 | fmt.Fprintln(os.Stderr, "Starting to read packets") |
| 49 | count := 0 |
| 50 | bytes := int64(0) |
| 51 | start := time.Now() |
| 52 | errors := 0 |
| 53 | truncated := 0 |
| 54 | layertypes := map[gopacket.LayerType]int{} |
| 55 | defragger := ip4defrag.NewIPv4Defragmenter() |
| 56 | |
| 57 | for packet := range source.Packets() { |
| 58 | count++ |
| 59 | bytes += int64(len(packet.Data())) |
| 60 | |
| 61 | // defrag the IPv4 packet if required |
| 62 | if *defrag { |
| 63 | ip4Layer := packet.Layer(layers.LayerTypeIPv4) |
| 64 | if ip4Layer == nil { |
| 65 | continue |
| 66 | } |
| 67 | ip4 := ip4Layer.(*layers.IPv4) |
| 68 | l := ip4.Length |
| 69 | |
| 70 | newip4, err := defragger.DefragIPv4(ip4) |
| 71 | if err != nil { |
| 72 | log.Fatalln("Error while de-fragmenting", err) |
| 73 | } else if newip4 == nil { |
| 74 | continue // packet fragment, we don't have whole packet yet. |
| 75 | } |
| 76 | if newip4.Length != l { |
| 77 | fmt.Printf("Decoding re-assembled packet: %s\n", newip4.NextLayerType()) |
| 78 | pb, ok := packet.(gopacket.PacketBuilder) |
| 79 | if !ok { |
| 80 | panic("Not a PacketBuilder") |
| 81 | } |
| 82 | nextDecoder := newip4.NextLayerType() |
| 83 | nextDecoder.Decode(newip4.Payload, pb) |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | if *dump { |
| 88 | fmt.Println(packet.Dump()) |
| 89 | } else if *print { |
| 90 | fmt.Println(packet) |
| 91 | } |
| 92 | if !*lazy || *print || *dump { // if we've already decoded all layers... |
no test coverage detected